Consider that "one of the biggest batteries in the world" stores 129 MWh, enough to sustain the US grid for one second.[1] (Of course, it can't discharge that quickly, so we really need four thousand of them to sustain the grid for one hour).

For comparison, the current capacity of pumped-storage hydroelectricity in the US is about 550GWh[2], the equivalent of about four thousand of those facilities. And we still don't have enough storage to replace nonrenewables with solar.

Batteries like that one won't reduce the actual price of energy storage here until Tesla builds thousands of installations in the US alone. And it would take hundreds of thousands worldwide (along with solar generation) to replace nonrenewable generation.

But it is a promising technology. If many are built quickly, and the reported financials prove accurate and scalable, we might have cheap grid-scale storage in ten or twenty years.

1: According to the US Energy Information administration, the US grid generates about 4 billion MWh per year.

https://www.eia.gov/energyexplained/electricity/electricity-...

That's about 127 MWh per second.

2: "[In the United States] forty-three PSH plants with a total power capacity of 21.9 GW and estimated energy storage capacity of 553 GWh accounted for 93% of utility-scale storage power capacity (GW) and more than 99% of electrical energy storage (GWh) in 2019."

https://www.energy.gov/sites/prod/files/2021/01/f82/us-hydro...